A project which builds without problem in 18.104.22.168 always throws an Out Of Memory exception when building in version 6.5. The project simply can't be built in 6.5 even after a clean reboot with no other applications open.
6.2 uses 35mb of ram during a build. 6.5 uses over 1gb of memory building the same project. The PC has 24gb of ram and nothing else is running.
I have had to uninstall 6.5 and go back to 22.214.171.124.